From patchwork Mon Jul 16 05:50:22 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vinod Koul X-Patchwork-Id: 10525495 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id C266C60348 for ; Mon, 16 Jul 2018 05:51:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AED1728A95 for ; Mon, 16 Jul 2018 05:51:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A322028A9B; Mon, 16 Jul 2018 05:51:16 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 639A728A97 for ; Mon, 16 Jul 2018 05:51:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727238AbeGPGQx (ORCPT ); Mon, 16 Jul 2018 02:16:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:37114 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726811AbeGPGQx (ORCPT ); Mon, 16 Jul 2018 02:16:53 -0400 Received: from localhost.localdomain (unknown [122.178.242.94]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3C8BF208DB; Mon, 16 Jul 2018 05:51:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1531720271; bh=6+OBQNvRg3jErPCKQ+HAePMkltPA+PT3CAaXbXhfc24=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yiA0f10EU7rBHVJWS4gRZkT/2O7IvuVuAz1aZ2oQVMQXj9Q4BYWv7v0PD2XkA2QIH LUf8gnaeWhT+7jS5KjaeJctKcM/vHHzpSbN0cGXHe2sTqQ3pIcW/VcGEF9r9tBhmSB 7YuNiKuSwsYpRGs/Hw48DCvEoMw6K+UY5iR2/9yU= From: Vinod Koul To: linux-crypto@vger.kernel.org Cc: Bjorn Andersson , Matt Mackall , Herbert Xu , linux-arm-msm@vger.kernel.org, Stephen Boyd , Timur Tabi , Jeffrey Hugo , Vinod Koul Subject: [PATCH v6 1/6] hwrng: remove msm hw_random driver Date: Mon, 16 Jul 2018 11:20:22 +0530 Message-Id: <20180716055027.3048-2-vkoul@kernel.org> X-Mailer: git-send-email 2.14.4 In-Reply-To: <20180716055027.3048-1-vkoul@kernel.org> References: <20180716055027.3048-1-vkoul@kernel.org> Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This driver is for a psedo-rng so should not be added in hwrng. Remove it so that it's replacement can be added. Signed-off-by: Vinod Koul --- drivers/char/hw_random/Kconfig | 13 --- drivers/char/hw_random/Makefile | 1 - drivers/char/hw_random/msm-rng.c | 183 --------------------------------------- 3 files changed, 197 deletions(-) delete mode 100644 drivers/char/hw_random/msm-rng.c diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index c34b257d852d..dac895dc01b9 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -307,19 +307,6 @@ config HW_RANDOM_HISI If unsure, say Y. -config HW_RANDOM_MSM - tristate "Qualcomm SoCs Random Number Generator support" - depends on HW_RANDOM && ARCH_QCOM - default HW_RANDOM - ---help--- - This driver provides kernel-side support for the Random Number - Generator hardware found on Qualcomm SoCs. - - To compile this driver as a module, choose M here. the - module will be called msm-rng. - - If unsure, say Y. - config HW_RANDOM_ST tristate "ST Microelectronics HW Random Number Generator support" depends on HW_RANDOM && ARCH_STI diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index 533e913c93d1..e35ec3ce3a20 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -29,7 +29,6 @@ obj-$(CONFIG_HW_RANDOM_POWERNV) += powernv-rng.o obj-$(CONFIG_HW_RANDOM_HISI) += hisi-rng.o obj-$(CONFIG_HW_RANDOM_BCM2835) += bcm2835-rng.o obj-$(CONFIG_HW_RANDOM_IPROC_RNG200) += iproc-rng200.o -obj-$(CONFIG_HW_RANDOM_MSM) += msm-rng.o obj-$(CONFIG_HW_RANDOM_ST) += st-rng.o obj-$(CONFIG_HW_RANDOM_XGENE) += xgene-rng.o obj-$(CONFIG_HW_RANDOM_STM32) += stm32-rng.o diff --git a/drivers/char/hw_random/msm-rng.c b/drivers/char/hw_random/msm-rng.c deleted file mode 100644 index 841fee845ec9..000000000000 --- a/drivers/char/hw_random/msm-rng.c +++ /dev/null @@ -1,183 +0,0 @@ -/* - * Copyright (c) 2011-2013, The Linux Foundation. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 and - * only version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - */ -#include -#include -#include -#include -#include -#include -#include - -/* Device specific register offsets */ -#define PRNG_DATA_OUT 0x0000 -#define PRNG_STATUS 0x0004 -#define PRNG_LFSR_CFG 0x0100 -#define PRNG_CONFIG 0x0104 - -/* Device specific register masks and config values */ -#define PRNG_LFSR_CFG_MASK 0x0000ffff -#define PRNG_LFSR_CFG_CLOCKS 0x0000dddd -#define PRNG_CONFIG_HW_ENABLE BIT(1) -#define PRNG_STATUS_DATA_AVAIL BIT(0) - -#define MAX_HW_FIFO_DEPTH 16 -#define MAX_HW_FIFO_SIZE (MAX_HW_FIFO_DEPTH * 4) -#define WORD_SZ 4 - -struct msm_rng { - void __iomem *base; - struct clk *clk; - struct hwrng hwrng; -}; - -#define to_msm_rng(p) container_of(p, struct msm_rng, hwrng) - -static int msm_rng_enable(struct hwrng *hwrng, int enable) -{ - struct msm_rng *rng = to_msm_rng(hwrng); - u32 val; - int ret; - - ret = clk_prepare_enable(rng->clk); - if (ret) - return ret; - - if (enable) { - /* Enable PRNG only if it is not already enabled */ - val = readl_relaxed(rng->base + PRNG_CONFIG); - if (val & PRNG_CONFIG_HW_ENABLE) - goto already_enabled; - - val = readl_relaxed(rng->base + PRNG_LFSR_CFG); - val &= ~PRNG_LFSR_CFG_MASK; - val |= PRNG_LFSR_CFG_CLOCKS; - writel(val, rng->base + PRNG_LFSR_CFG); - - val = readl_relaxed(rng->base + PRNG_CONFIG); - val |= PRNG_CONFIG_HW_ENABLE; - writel(val, rng->base + PRNG_CONFIG); - } else { - val = readl_relaxed(rng->base + PRNG_CONFIG); - val &= ~PRNG_CONFIG_HW_ENABLE; - writel(val, rng->base + PRNG_CONFIG); - } - -already_enabled: - clk_disable_unprepare(rng->clk); - return 0; -} - -static int msm_rng_read(struct hwrng *hwrng, void *data, size_t max, bool wait) -{ - struct msm_rng *rng = to_msm_rng(hwrng); - size_t currsize = 0; - u32 *retdata = data; - size_t maxsize; - int ret; - u32 val; - - /* calculate max size bytes to transfer back to caller */ - maxsize = min_t(size_t, MAX_HW_FIFO_SIZE, max); - - ret = clk_prepare_enable(rng->clk); - if (ret) - return ret; - - /* read random data from hardware */ - do { - val = readl_relaxed(rng->base + PRNG_STATUS); - if (!(val & PRNG_STATUS_DATA_AVAIL)) - break; - - val = readl_relaxed(rng->base + PRNG_DATA_OUT); - if (!val) - break; - - *retdata++ = val; - currsize += WORD_SZ; - - /* make sure we stay on 32bit boundary */ - if ((maxsize - currsize) < WORD_SZ) - break; - } while (currsize < maxsize); - - clk_disable_unprepare(rng->clk); - - return currsize; -} - -static int msm_rng_init(struct hwrng *hwrng) -{ - return msm_rng_enable(hwrng, 1); -} - -static void msm_rng_cleanup(struct hwrng *hwrng) -{ - msm_rng_enable(hwrng, 0); -} - -static int msm_rng_probe(struct platform_device *pdev) -{ - struct resource *res; - struct msm_rng *rng; - int ret; - - rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL); - if (!rng) - return -ENOMEM; - - platform_set_drvdata(pdev, rng); - - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - rng->base = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(rng->base)) - return PTR_ERR(rng->base); - - rng->clk = devm_clk_get(&pdev->dev, "core"); - if (IS_ERR(rng->clk)) - return PTR_ERR(rng->clk); - - rng->hwrng.name = KBUILD_MODNAME, - rng->hwrng.init = msm_rng_init, - rng->hwrng.cleanup = msm_rng_cleanup, - rng->hwrng.read = msm_rng_read, - - ret = devm_hwrng_register(&pdev->dev, &rng->hwrng); - if (ret) { - dev_err(&pdev->dev, "failed to register hwrng\n"); - return ret; - } - - return 0; -} - -static const struct of_device_id msm_rng_of_match[] = { - { .compatible = "qcom,prng", }, - {} -}; -MODULE_DEVICE_TABLE(of, msm_rng_of_match); - -static struct platform_driver msm_rng_driver = { - .probe = msm_rng_probe, - .driver = { - .name = KBUILD_MODNAME, - .of_match_table = of_match_ptr(msm_rng_of_match), - } -}; -module_platform_driver(msm_rng_driver); - -MODULE_ALIAS("platform:" KBUILD_MODNAME); -MODULE_AUTHOR("The Linux Foundation"); -MODULE_DESCRIPTION("Qualcomm MSM random number generator driver"); -MODULE_LICENSE("GPL v2");